\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Descripte statistiscs: t-tests for the differences}
\begin{tabular}{l*{4}{cc}}
\toprule
                    &\multicolumn{2}{c}{\makecell{Young \\ men \\ (1)}}&\multicolumn{2}{c}{\makecell{Young \\ women \\ (2)}}&\multicolumn{2}{c}{\makecell{Old \\ men \\ (3)}}&\multicolumn{2}{c}{\makecell{Old \\ women \\ (4)}}\\
\midrule
Change in planned contacts&        3.81&   \sym{***}&        3.14&   \sym{***}&        3.55&            &        3.59&            \\
                    &      (0.13)&            &      (0.13)&            &      (0.17)&            &      (0.18)&            \\
Change in planned hand cleaning effort&       10.92&   \sym{***}&       11.54&            &       11.85&    \sym{**}&       12.06&   \sym{***}\\
                    &      (0.12)&            &      (0.12)&            &      (0.15)&            &      (0.16)&            \\
\emph{Support for gov. regulation (in \%)}&            &            &            &            &            &            &            &            \\
\hspace{0.2cm} Are too much&        0.12&   \sym{***}&        0.09&            &        0.06&    \sym{**}&        0.05&   \sym{***}\\
                    &      (0.01)&            &      (0.01)&            &      (0.01)&            &      (0.01)&            \\
\hspace{0.2cm} Are appropriate&        0.34&    \sym{**}&        0.29&     \sym{*}&        0.33&            &        0.27&     \sym{*}\\
                    &      (0.02)&            &      (0.02)&            &      (0.02)&            &      (0.02)&            \\
\hspace{0.2cm} Are too little&        0.54&   \sym{***}&        0.62&            &        0.61&            &        0.69&   \sym{***}\\
                    &      (0.02)&            &      (0.02)&            &      (0.02)&            &      (0.02)&            \\
\emph{Change wrt. regulation (in \%)}&            &            &            &            &            &            &            &            \\
\hspace{0.2cm} Less than required&        0.09&   \sym{***}&        0.06&            &        0.07&            &        0.03&   \sym{***}\\
                    &      (0.01)&            &      (0.01)&            &      (0.01)&            &      (0.01)&            \\
\hspace{0.2cm} According to regulations&        0.34&   \sym{***}&        0.32&     \sym{*}&        0.21&   \sym{***}&        0.24&    \sym{**}\\
                    &      (0.02)&            &      (0.02)&            &      (0.02)&            &      (0.02)&            \\
\hspace{0.2cm} More than required&        0.57&   \sym{***}&        0.62&            &        0.72&   \sym{***}&        0.73&   \sym{***}\\
                    &      (0.02)&            &      (0.02)&            &      (0.02)&            &      (0.02)&            \\
\bottomrule
\multicolumn{9}{l}{\footnotesize \parbox{12cm}{\emph{Notes:} Table shows mean values per subgroup and standard errors in parentheses. Stars indicate the significance of the mean values to the average mean values of the other groups (t-tests). \sym{*} \(p<0.1\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\)}}\\
\end{tabular}
\end{table}
